Efficient enantiospecific synthesis of key A-ring synthons for the preparation of 1. alpha., 25-dihydroxyvitamin D3 using a chromium (II)-mediated reaction

S Hatakeyama, H Numata, K Osanai…

Index: Hatakeyama, Susumi; Numata, Hirotoshi; Osanai, Ken; Takano, Seiichi Journal of Organic Chemistry, 1989 , vol. 54, # 15 p. 3515 - 3517

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Citation Number: 55

Abstract

(6) (a) Schaefer, JP; Bloomfield, JJ Org. React. 1967, 15, 1. (b) Tarnchompoo, B.; Thebtaranonth, C.; Thebtaranonth, Y. Synthesis 1986, 785. (c) Kodpinid, M.; Siwapinyoyos, T.; Thebtaranonth, Y. J. Am. Chem. SOC. 1984,106,4862. (d) Flavin, M. T.; Lu, M. C. Tetrahedron Lett. 1983, 2335. (e) Gianturco, M. A.; Friedel, P.; Giammarino, A. S. Tetrahedron 1964,20, 1763. (7) Krapcho, A. P.; Lovey, AJ Tetrahedron Lett. 1973,957. (8) Block. E. Reactions of ...

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